Boiler-furnace.



a boiler; a cylindrical furnace shell extending from said boiler; a draft shell surrounding the -furnace shell and exposed to the outer air and adapted to convey air from the boiler end of said furnace to the front end of said furnace shell; means for conveyig the air from the draft shell to the furnace shell at the iront end of the furJ nace; and a cylindrical regulator arranged Within said draft shell and at the front of the furnace to control the passage of air from the draft shell tc the furnace. c*

i 2. In a boiler furnace, the combination vith a boiler of a cylindrical furnace shell secured to the front of the boiler; a draft shell surroimding the furnace shell and adapted to convey air from the boiler end of the furnace to the front end of the furnace; a furnace head having an inwardly extending cylindrical flange having draft openings therein; and a regulating ring arranged on the flange, the ring having openings adapted to be brought into and out of register with openings in the flange to regulatc the draft.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN DICK. Witnesses:

F. D. VVooDwonTH, E. P. CULLUM. 

